Display images in multiline Braille

chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
index 2920129c28d0bf7d3f7a54df80674c10a22a6cb9..e89ed9b7e37636bd746a6878582cd1088dbf18af 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
@@ -62,6 +62,8 @@ DesktopAutomationHandler = function(node) {
                     this.onFocus);
   this.addListener_(EventType.HOVER,
                     this.onHover);
+  this.addListener_(EventType.IMAGE_FRAME_UPDATED,
+                    this.onImageFrameUpdated);
   this.addListener_(EventType.INVALID_STATUS_CHANGED,
                     this.onEventIfInRange);
   this.addListener_(EventType.LOAD_COMPLETE,
@@ -413,6 +415,33 @@ DesktopAutomationHandler.prototype = {
   },
 
   /**
+   * Provides all feedback once a image frame updated event fires.
+   * @param {!AutomationEvent} evt
+   */
+  onImageFrameUpdated: function(evt) {
+    var node = evt.target;

[David Tseng, 2017/02/22 18:15:24]

I don't think you need most or any of this. If this event comes back as a result
of us requesting image data, then just output the braille directly without all
of the calls to Output.

+    if (!node)
+      return;
+
+    // If |node| is NOT in the current range, return
+    var prevRange = ChromeVoxState.instance.currentRange;
+    if (!prevRange.contentEquals(cursors.Range.fromNode(node)) &&
+        !node.state.focused) {
+      return;
+    }
+
+    var output = new Output();
+    if (!this.textEditHandler_) {
+      output.withBraille(
+          ChromeVoxState.instance.currentRange, prevRange, evt.type);
+    } else {
+      // Delegate event handling to the text edit handler for braille.
+      this.textEditHandler_.onEvent(evt);
+    }
+    output.go();
+  },
+
+  /**
    * Provides all feedback once a value changed event fires.
    * @param {!AutomationEvent} evt
    */